chore: bump coder/jetbrains-gateway/coder in /dogfood/coder-envbuilder

---
updated-dependencies:
- dependency-name: coder/jetbrains-gateway/coder
  dependency-version: 1.2.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

dogfood/coder-envbuilder/main.tf

@@ -137,7 +137,7 @@ module "code-server" {
 
 module "jetbrains_gateway" {
   source         = "registry.coder.com/coder/jetbrains-gateway/coder"
-  version        = "1.1.1"
+  version        = "1.2.6"
   agent_id       = coder_agent.dev.id
   agent_name     = "dev"
   folder         = local.repo_dir